I 100% agree with this (actually floated it as an idea a while ago - https://youtu.be/eRhJTYfdUEA?si=ouM4lBh1n6TZrrgV&t=187) and am a little surprised that it isn’t happening.
It seems like a no-brainer, as it allows SketchUp to maintain its position as “the easy to learn modeling program,” while also allowing it to compete with other modeling softwares in terms of modeling features.
I think there might be a little marketing confusion around what to do with extensions. On the one hand, they’re tools that make SketchUp significantly better, but on the other, they’re not really tools “from” SketchUp, so I’d imagine they’re a little tricky to handle from a marketing standpoint.